package net.lzzy.practices.web.course;

import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import net.lzzy.practices.constants.ApiConstants;
import net.lzzy.practices.constants.Messages;
import net.lzzy.practices.entities.Course;
import net.lzzy.practices.entities.User;
import net.lzzy.practices.service.CourseService;
import net.lzzy.practices.service.UserService;
import net.lzzy.practices.utils.StringUtils;
import net.lzzy.practices.web.models.*;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import java.util.ArrayList;
import java.util.List;
import java.util.UUID;

/**
 * @author 渊何
 */
@Api(tags = "课程相关业务")
@CrossOrigin
@RestController
@RequestMapping(ApiConstants.ROUTE_COURSE_ROOT)
public class CourseApiController {
    private final CourseService service;
    private final UserService uService;

    @Autowired
    public CourseApiController(CourseService service, UserService userService) {
        this.service = service;
        this.uService = userService;
    }

    @ApiOperation(value = "获取所有课程", notes = "<b>参数包括：</b><br/>&nbsp;&nbsp;&nbsp;&nbsp;token(String)<br/>")
    @GetMapping(ApiConstants.ROUTE_COURSE_ALL)
    public ApiResult getCourses(@RequestParam String token) {
        List<VmCourse> courses = new ArrayList<>();
        service.get().forEach(course -> courses.add(VmCourse.create(course, false)));
        return new ApiResult(true, courses.size() + "", courses);
    }

    @ApiOperation(value = "获取所有开放的课程", notes = "1.token(String)<br/>2.page(int)<br/>3.size(int)<br/>")
    @GetMapping(ApiConstants.ROUTE_COURSE_OPEN)
    public ApiResult getOpenCourses(@RequestParam String token) {
        List<VmCourse> courses = new ArrayList<>();
        service.get(true).forEach(course -> courses.add(VmCourse.create(course, false)));
        return new ApiResult(true, courses.size() + "", courses);
    }

    @ApiOperation(value = "分页获取所有课程", notes = "<b>参数包括：</b><br/>&nbsp;&nbsp;&nbsp;&nbsp;token(String)<br/>")
    @GetMapping(ApiConstants.ROUTE_COURSE_PAGE)
    public ApiResult getPagedCourses(@RequestParam int page, @RequestParam String token, @RequestParam int size) {
        List<VmCourse> courses = new ArrayList<>();
        service.get(page, size).forEach(course -> courses.add(VmCourse.create(course, false)));
        return new ApiResult(true, service.count() + "", courses);
    }

    @ApiOperation(value = "分页获取所有开放课程", notes = "1.token(String)<br/>2.page(int)<br/>3.size(int)<br/>")
    @GetMapping(ApiConstants.ROUTE_COURSE_OPEN_PAGE)
    public ApiResult getPagedOpenCourses(@RequestParam String token, @RequestParam int page, @RequestParam int size) {
        List<VmCourse> courses = new ArrayList<>();
        service.get(true, page, size).forEach(course -> courses.add(VmCourse.create(course, false)));
        return new ApiResult(true, service.count() + "", courses);
    }

    @ApiOperation(value = "获取某教师所有课程", notes = "<b>参数包括：</b><br/>&nbsp;&nbsp;&nbsp;&nbsp;1.token(String)<br/>2.id(UUID)<br/>")
    @GetMapping(ApiConstants.ROUTE_COURSE_TEACHER)
    public ApiResult getTeachersCourses(@RequestParam String token, @RequestParam(name = "id") UUID teacherId) {
        List<VmCourse> courses = new ArrayList<>();
        service.getTeachersCourses(teacherId).forEach(course -> courses.add(VmCourse.create(course, true)));
        return new ApiResult(true, courses.size() + "", courses);
    }

    @ApiOperation(value = "获取某学生所有课程", notes = "1.token(String)<br/>2.id(UUID)<br/>")
    @GetMapping(ApiConstants.ROUTE_COURSE_STUDENT)
    public ApiResult getStudentsCourses(@RequestParam String token, @RequestParam(name = "id") UUID studentId) {
        List<VmCourse> courses = new ArrayList<>();
        service.getTeachersCourses(studentId).forEach(course -> courses.add(VmCourse.create(course, false)));
        return new ApiResult(true, courses.size() + "", courses);
    }

    @ApiOperation(value = "添加课程", notes = "1.token(String)<br/>2.name(String)<br/>3.desc(String)<br/>" +
            "4.cover(int)<br/>5.tId(String)<br/>6.open(boolean)<br/>")
    @PostMapping(value = ApiConstants.ROUTE_COURSE_ADD, produces = "application/json", consumes = "application/json")
    public ApiResult add(@RequestBody CourseInfo info) {
        return addOrUpdate(null, info);
    }

    private ApiResult addOrUpdate(UUID id, CourseInfo info) {
        String token = info.getToken();
        String name = info.getName();
        String desc = info.getDesc();
        String cover = info.getCover();
        String teacherId = info.getTid();
        boolean open = info.isOpen();
        if (StringUtils.isEmpty(name) ||
                StringUtils.isEmpty(token) ||
                StringUtils.isEmpty(desc) ||
                StringUtils.isEmpty(cover) ||
                StringUtils.isEmpty(teacherId)) {
            return new ApiResult(false, Messages.INCOMPLETE_INFO.toString(), null);
        }
        User teacher = uService.getById(UUID.fromString(teacherId));
        if (teacher == null) {
            return new ApiResult(false, Messages.WRONG_ID.toString(), null);
        }
        Course course;
        boolean create = id == null;
        if (create) {
            course = new Course();
            course.setTeacher(teacher);
        } else {
            course = service.getById(id);
            if (course == null) {
                return new ApiResult(false, Messages.WRONG_ID.toString(), null);
            }
        }
        course.setOpen(open);
        course.setCover(cover);
        course.setName(name);
        course.setDescription(desc);
        if (create) {
            return new ApiResult(true, Messages.SUCCESS.toString(), VmCourse.create(service.add(course), true));
        } else {
            Course updated = service.update(course, token);
            if (updated == null) {
                return new ApiResult(false, Messages.NO_PERMISSION.toString(), null);
            }
            return new ApiResult(true, Messages.SUCCESS.toString(), VmCourse.create(updated, true));
        }
    }

    @ApiOperation(value = "更新课程", notes = "1.token(String)<br/>")
    @PostMapping(ApiConstants.ROUTE_COURSE_UPDATE)
    public ApiResult update(@PathVariable UUID id, @RequestBody CourseInfo info) {
        return addOrUpdate(id, info);
    }

    @ApiOperation(value = "开发或关闭课程", notes = "1.token(String)<br/>2.courseId(String)<br/>3.open(boolean)<br/>")
    @PostMapping(ApiConstants.ROUTE_COURSE_OPEN_CLOSE)
    public ApiResult openCloseCourse(@RequestBody CourseOpenInfo info) {
        String strCourseId = info.getCourseId();
        String token = info.getToken();
        boolean open = info.isOpen();
        if (StringUtils.isEmpty(strCourseId) || StringUtils.isEmpty(token)) {
            return new ApiResult(false, Messages.INCOMPLETE_INFO.toString(), null);
        }
        Course course = service.openCloseCourse(UUID.fromString(strCourseId), open, token);
        if (course == null) {
            return new ApiResult(false, Messages.WRONG_ID.toString(), null);
        }
        return new ApiResult(true, Messages.SUCCESS.toString(), VmCourse.create(course, true));
    }

    @ApiOperation(value = "删除课程", notes = "1.token(String)<br/>2.courseId(String)<br/>")
    @DeleteMapping(ApiConstants.ROUTE_COURSE_REMOVE)
    public ApiResult delete(@RequestBody CourseKeyInfo info) {
        String strCourseId = info.getCourseId();
        String token = info.getToken();
        if (StringUtils.isEmpty(strCourseId) || StringUtils.isEmpty(token)) {
            return new ApiResult(false, Messages.INCOMPLETE_INFO.toString(), null);
        }
        Messages msg = service.remove(UUID.fromString(strCourseId), token);
        return new ApiResult(msg == Messages.SUCCESS, msg.toString(), null);
    }
}
